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            <h1 id="Express介绍"><a href="#Express介绍" class="headerlink" title="Express介绍"></a>Express介绍</h1><ul>
<li>Express 是一个简洁而灵活的 node.js Web应用框架, 提供一系列强大特性帮助你创建各种Web应用</li>
<li>丰富的HTTP工具以及来自Connect框架的中间件随取随用，创建强健、友好的API变得快速又简单</li>
<li>Express 不对 node.js 已有的特性进行二次抽象，我们只是在它之上扩展了Web应用所需的功能</li>
</ul>
<p>使用 Express 可以快速地搭建一个完整功能的网站，它有一套健壮的特性，可用于开发单页、多页和混合Web应用。</p>
<h2 id="开始"><a href="#开始" class="headerlink" title="开始"></a>开始</h2><p>在确认已经安装了node之后(<a href="https://nodejs.org/en/#download" target="_blank" rel="noopener">下载</a>), 在你的机器上创建一个目录，让我们来开始你的第一个应用程序吧</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//新建一个目录文件夹,初始化一个packjson.json文件</span></span><br><span class="line">    $mkdir express-demo &amp;&amp; cd express-demo  &amp;&amp; npm init</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//安装Express</span></span><br><span class="line">$ npm install express -g</span><br></pre></td></tr></table></figure>
<p>现在我们来写真正的代码了！创建一个名为app.js 或者 server.js的文件，叫什么看你个人喜好了。 载入express 然后使用代码 express()创建一个新的应用程序:<br><a id="more"></a></p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> express = <span class="built_in">require</span>(<span class="string">'express'</span>);</span><br><span class="line"><span class="keyword">var</span> app = express();</span><br></pre></td></tr></table></figure>
<p>在这个应用程序实例里，你可以通过 app.VERB()定义路由，下面的例子是”GET /“返回 “Hello World” 字符串。 req 和 res 对象是和node原生提供给你的一致的，你也可以执行 res.pipe(), req.on(‘data’, callback) 等任何事情在没有Express的情况下可以做的事情。</p>
<p>Express 给这些对象加了一个封装好的方法，比如 res.send(), 它会帮你设置Content-Length:</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">app.get(<span class="string">'./'</span>,<span class="function"><span class="keyword">function</span>(<span class="params">req,res</span>)</span>&#123;</span><br><span class="line">    <span class="built_in">console</span>.log(<span class="string">"GET 请求成功"</span>)；</span><br><span class="line">    req.send(<span class="string">'Hello Express'</span>);</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<p>现在我们通过执行 app.listen() 来绑定并监听连接。 它接受的参数和nodenet.Server#listen()的方法一致:</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">app.listen(<span class="number">3000</span>,<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="built_in">console</span>.log(<span class="string">'Listening on port %d'</span>, server.address().port);</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<p>然后在终端执行<code>node app.js</code> 打开3000端口的页面就会看到<code>Hello Express</code>了</p>
<h2 id="使用express-generator-快速生成一个应用程序"><a href="#使用express-generator-快速生成一个应用程序" class="headerlink" title="使用express-generator 快速生成一个应用程序"></a>使用express-generator 快速生成一个应用程序</h2><h3 id="安装express-generator"><a href="#安装express-generator" class="headerlink" title="安装express-generator"></a>安装express-generator</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ npm install express-generator -g</span><br></pre></td></tr></table></figure>
<p>这个工具提供了一个非常简单的生成一个程序骨架的功能，但是它也有局限，比如它只支持很少的几个模板引擎。 而事实上Express几乎支持所有的为node所建的模板引擎。 使用 –help查看一下帮助:</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">Usage: express [options]</span><br><span class="line"></span><br><span class="line">Options:</span><br><span class="line"></span><br><span class="line">  -h, --help          输出帮助信息</span><br><span class="line">  -V, --version       输出版本号</span><br><span class="line">  -e, --ejs           添加 ejs 模板引擎支持 (默认为jade)</span><br><span class="line">  -H, --hogan         添加 hogan.js模板引擎支持</span><br><span class="line">  -c, --css   样式 &lt;引擎&gt; 支持 (less|stylus) (默认为css)</span><br><span class="line">  -f, --force         强制在非空目录执行</span><br></pre></td></tr></table></figure>
<h3 id="使用"><a href="#使用" class="headerlink" title="使用"></a>使用</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ express myapp</span><br></pre></td></tr></table></figure>
<p>生成目录的如下:<br><img src="http://hexobed.oss-cn-beijing.aliyuncs.com/18-4-28/74845117.jpg" alt="express"></p>
<p>默认为<a href="http://jade-lang.com/" target="_blank" rel="noopener">jade</a>和<code>css</code>的结构</p>
<p><strong>如果你想生成一个支持<a href="https://ejs.bootcss.com/" target="_blank" rel="noopener">ejs</a>, <a href="http://stylus-lang.com/" target="_blank" rel="noopener">Stylus</a>的应用程序，只需要简单的执行下面的命令</strong>：</p>
<p>则生成的目录为<br><img src="http://hexobed.oss-cn-beijing.aliyuncs.com/18-4-28/16498387.jpg" alt="ejs"></p>
<ul>
<li>app.js：启动文件，或者说入口文件</li>
<li>package.json：存储着工程的信息及模块依赖，当在 dependencies 中添加依赖的模块时，运行npm install，npm 会检查当前目录下的 package.json，并自动安装所有指定的模块</li>
<li>node_modules：存放 package.json 中安装的模块，当你在 package.json 添加依赖的模块并安装后，存放在这个文件夹下</li>
<li>public：存放 image、css、js 等文件</li>
<li>routes：存放路由文件</li>
<li>views：存放视图文件或者说模版文件</li>
<li>bin：存放可执行文件</li>
</ul>
<p><strong>执行应用</strong></p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">cd myapp</span><br><span class="line">npm install</span><br><span class="line">DEBUG=myapp:* npm start</span><br></pre></td></tr></table></figure>
<p>打开3000端口就会看到如下页面：<br><img src="http://hexobed.oss-cn-beijing.aliyuncs.com/18-4-28/44690178.jpg" alt="expressapp"></p>
<p>这些就是一个简单的应用程序创建和运行的所有步骤。 记住Express没有限定任何的目录结构，这只是一个方便你工作的基本结构。 如果你想得到更多怎么组织目录结构选择，可以查看github上的<a href="https://github.com/expressjs/express/tree/master/examples" target="_blank" rel="noopener">示例</a>。</p>
<h2 id="推荐"><a href="#推荐" class="headerlink" title="推荐"></a>推荐</h2><p>最后给大家推荐一个更详细的例子：<a href="http://ourjs.com/detail/56b2a6f088feaf2d031d2468" target="_blank" rel="noopener">使用express搭建一个简单的博客</a>;</p>

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                    <h4>Contents</h4>
                    <ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#Express介绍"><span class="toc-number">1.</span> <span class="toc-text">Express介绍</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#开始"><span class="toc-number">1.1.</span> <span class="toc-text">开始</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#使用express-generator-快速生成一个应用程序"><span class="toc-number">1.2.</span> <span class="toc-text">使用express-generator 快速生成一个应用程序</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#安装express-generator"><span class="toc-number">1.2.1.</span> <span class="toc-text">安装express-generator</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#使用"><span class="toc-number">1.2.2.</span> <span class="toc-text">使用</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#推荐"><span class="toc-number">1.3.</span> <span class="toc-text">推荐</span></a></li></ol></li></ol>
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    <!-- Slides wrapper with overflow:hidden. -->
    <div class="pswp__scroll-wrap">
        <!-- Container that holds slides. 
            PhotoSwipe keeps only 3 of them in the DOM to save memory.
            Don't modify these 3 pswp__item elements, data is added later on. -->
        <div class="pswp__container">
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>
        <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
        <div class="pswp__ui pswp__ui--hidden">
            <div class="pswp__top-bar">
                <!--  Controls are self-explanatory. Order can be changed. -->
                <div class="pswp__counter"></div>
                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
                <button class="pswp__button pswp__button--share" title="Share"></button>
                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                      <div class="pswp__preloader__cut">
                        <div class="pswp__preloader__donut"></div>
                      </div>
                    </div>
                </div>
            </div>
            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div> 
            </div>
            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>
            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>
            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>
        </div>
    </div>
</div>



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